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4 - 8 sin^2 x

 

answer: 4cos2x

how?

Guest May 17, 2017
 #1
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+2

 

4 - 8 sin^2 (x)        factor

 

4  [ 1  - 2 sin^2 (x)   ]      remember that  1 - 2sin^2x  =  cos (2x)

 

So  we end up with

 

4  cos (2x)

 

 

 

cool cool cool

CPhill  May 17, 2017
edited by CPhill  May 17, 2017

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